hoelemann



R. HOELEMANN.

SAFETY LATCH FOR PRESSES.

APPLICATION r1150 JUNK-114.1 1916.

if @331 Min 611mm,

RICHARD I-IOELEMANN; on NEW York; N. Y.-

SAFETY-LATCH Eon PnEssEsf' Specification of eads Patent. 1 a1je t d bet.1919.

Application filed 31111614, 1 16. fsenalfno. ioacse.

To all whom it may concermi i I Be it known that I, RICHARD HQELEMANN, acitizen of the United States, residing in the city of New York, countyof Queens, and

State of New York, haveinvented certain new and useful Improvements inSafety- Latches for Presses, of which the following is a specification.I

My lnventlon relates in general to a safety device for use in connectionwith a clutch 7 mechanism'and while the invention is applicable to anymechanism where it is desired to limit the duration of the activeoperation of the clutch, the invention particularly relates to a safety.attachment for punch presses and similar machinery where it is desiredthat the clutch be moved into active position for one operation of. themachine and stopped automatically atthe end of its desired period ofoperation.

In power presses it is usual for theoperator to inaugurate the actuationof the machine by pressing upon a foottreadle or similar starting deviceand one of the objects of theinvention is toprovide, a simple, durable,and reliable safety mechanism designed to constitute an attachment toconventional forms of such machines and which will positively move theclutch mechanism into inoperative position-at the termination 'of oneactuation of the machine and independently of the position of thetreadle or manual control mechanism.

Incidental to an object of simplicity in design it. is a furtherdesideratum' of this invention to provide a device of the classdescribed with the least possible number of.

parts and which may be constructed with a minimum amount of machining,so as to provide a construction which can be mar keted at low cost.

ceptible of being installed on conventional forms of press machines, butwhich is de-- sired, may be readily removed for replace ment or repalrwlthout interrupting the con- 7 tinuous operation of the machine duringthe period when the safety device is removed.

Still another object of the invention is to provide a safety device inthe form of an attachment, which may be made of; some standard form andprovided with means for readily adjusting the same to fit differentmakes of machine.

Various other. objects and advantages of I theinvention be in partobvious" from an inspection of the accompanying draw- I v a, ings and inpart will be more fully set forth in the following particulardescription of one form of mechanism embodying my invention, and" theinvention also consists in certaininew and novel features ofconstruction and combination of parts, hereinafter set forth andclaimed. i

Referring to the accompanying drawings: Figure l is a view in sideelevation of a portion of a power press showing a form of clutchmechanism used With such machines and shown in looking position andshowing a preferred embodiment of my invention in normal inoperativeposition thereon with parts thereof broken away to show internalconstruction; Y w I Fig. 2 isa transversesectional View takenon'thebroken line 2-2 of Fig. 1;' and Fig. 3 is a view in side elevationof certain of'theparts shown'in 'Fig. 1, showing the safety attachmentin active clutch locking position. Y I a c In the following descriptionand in the claims, parts will be identified by specific i names forconvenienceof expression but they are intended to be as generic in theirapplication to similar parts as the art-will permit. v

In the drawings there isshown a clutch I wheel 4 loosely mounted uponthe crank? shaft 5 and a clutch member 6 including the projecting rockerarm 7, normally moved into clutching position by the rocker arm spring 8as is usual with one well known.

type .of clutch mechanism. It is usual in such machines to hold the;rocker arm in its unclutched or inoperative position by means ofa tripdog 9 pivotally mounted upon a pivot bolt 10. carried in a bracket 11and Another object .of the invention is to provide a safety device whichis not only susclude, a relatively strong treadle rod springl3gde'signed to move the trip dog into its locking positionjdisposedacross the path of movement of the rocker arm when pressure is releasedon the treadle red. It is to be understood that the construction so fardescribed is well known and the l. invention hereinafter describedparticularly relates to an attachment designed to be mounted upon thepivot bolt 10 which is elongated to accommodate the attachment.

The attachment include s a rocker frames 14, the upper end of which isprovided with a projecting finger 15 constituting a stop similar to theusual trip dog and designed, when the rocker arm is in its normalposition held by the trip dog, to bear against the side of the rockerarm so that normally the rocker arm constitutes a stop for maintainingthe projecting finger 15 in an inoperative position as shown in Figs. 1and 2. The rocking frame includes a depending tail 16, threaded'throughwhich is a setscrew 17, locked in position by the lock nut 18 anddesigned'to bear against some sultable stop 19, which, in the devicedisclosed, may be some fixed part of the machine. The rocking frame alsoincludes a kicking device 20 positioned above the bolt 10 for thepurpose of mov-i v the finger 15 into active position when i e leased bythe rocking arm. This kicking device includes a plunger 21 slidablymounted in a spring casing 22 demountably aflixed to the rocking framepreferably by screws 23 to permit the ready separation of the plungerand its coacting parts for the purpose of repair or substitution foranother kicking device. The plunger is maintained normally in projectedposition toward the stop 19 by means of a spring 2% housed within thecasing 22 but obviously having a tension less than the tension of thetreadle rod spring 13." The plunger is de signed to be set in adjustedposition by lock nuts 25 engaging the rear threaded end 26 of theplunger which projects rearwardly from the casing 22.

The tension of the treadle rod spring 13 is transmitted to the rockingframe through an adjustable stop 27, in the form of a set screw lockedin adjusted position in a rearward eX- tenslon 29 from the portion ofthe locking frame above its fulcrum; This set screw is disposed in thepath of the upward movement of the treadle rod, so that as tension isreleased on the treadle rod, the spring in resetting the dog in theposition shown in Fig. 1, will bear on the set screw 27 to move therocking frame from the position shown in Fig. 3 into the uprightposition shown in Fig. 1. r 3

In operation, it willbe understood that the clutch wheel t'is rotatingcontinuously and that when it is desired to actuate the crank-shaft 5,the operator depresses the treadle rod, thus swinging the trip dog fromthe position shown in Fig. 1 into the position shown in Fig. 3, thusremoving the dog from the path of movement of the rocker arm and at thesame time placing the heavy treadle rod spring under tension, all as isusual with well known devices of this character. I V

The removal of therocker'arm from the path of swinging movement of theproject- 111g finger 15 will permit the spring 24 to act on the plungerbearing against the stop 19 and thus re-act on the rocker frame to movethe same into the set position shown in Fig. 3' or until the end of theset screw 17 comes in contact with its stop 19. This set screw haspreviously been so adjusted that the projecting finger 15 is nowdisposed in. the path of movement of the rocker arm so I that as therocker arm rotates about in its shaft clutching position, it will nowcome in contact with the projecting finger disposed in its path with theresult that the rocker arm is rocked against the tension of its holdingspring and the clutch wheel thus automatically disconnected from thecrankshaft. It will be noted that this automatic unclutching by theauxiliary stop finger 15 will take place independent of the position onthe treadle rod, so that the operator by pressing on the treadle willcause but one actuation of the crank-shaft and the second stop 15 willautomatically causethe clutch to be moved into inoperative position atthe end of one rotation of the crank-shaft. By adjusting the set-screw17 the attachment may beheld in inoperative position which will notaffect the usual operation of the machine. 1

Releasing tension on the treadle rod will cause the heavy spring 13 toact on the trip dog moving the same back into its operative position andacting through the set screw 27 on the rocker frame to move the sameinto its normal position'shown in Fig. 1'.

At the same time the plunger spring 2 1 is placed under compression bythe depression of the plunger bearing on the stop 19. This actionremoves the projecting finger 15 from the path of movement of the rockerarm and permits the rocker arm to move slightly into position stopped bythe trip dog and the device is in position for a repetition of theactuation of the machine.

, By means of a device of this character it is possible to install asafety device on conventional forms of press machines merely bysubstituting a longer bolt for the bolts usually used to. piv'otallysupport the trip dog. These safety devicesmay be sold as simple articlesof manufacture and utilized as attachments to the several difi'erentforms of machines, as desired. With the different but the several setscrews carried by the attachment may be adjusted to fit any particularmachlne. The attachment may be readily removed and the machine actuatedas usual without a safety device and the fact that the conventionalforms of machines, need not be modified 111 any way to receive thesafety device constitutes one of the important features of thisinventionf While I have shown and described, and

have pointed out in the annexed claims, certain novel features of myinvention, it will be understood that various OII11SS1OIlS,'SL1bstitutions and changes in the form and details of the device illustratedand in its means normally acting on said supplemental stop to cause itto be positioned in the path of said revolving arm thereby to interceptits movement. I

2. In a device of the class described, the combination with a revolvingrocker arm and a trip dog normally disposed in the path of the rockerarm to intercept its movement and means having a movement independent ofthe trip dog and movable automatically into operative position to limitthe movement of the rocker arm upon the release of the trip dog and apivotal mounting for both the trip dog and for said limiting means.

3. In a device of the class described, the combination with a clutch andmanually controlled means for holding the clutch in an inoperativeposition, a pivot bolt, a supplemental stop normally held in aninoperative position by the held clutch rotatably mounted on said boltand resilient means independent of the manually controlled means formoving the stop into position to hold the clutch.

' 4:.In a device of the class described, the combination with a clutchand manually controlled means for-holding the clutchin an inoperativeposition, a supplemental stop normallyheld in an inoperative position bythe held clutch and resilient means carried 7 by the stop and movablebodily therewith for moving the stop into position to hold the clutch,said resilient means being operable automatically on the release of themanually controlled'mea ns.

5. In a device of the class described, the

combination ivith a clutch mechanism hav ing a definite path of travel,of a pair of stop members each pivoted for movement about a common axisand each movable across the path of the clutch mechanism to interceptthe movement of the same, said mechanism normally held by the mostadvanced of the pair of stop members and said mechanism when in heldposition disposedin the path of movement of the other stop member,

means for moving said advanced stop member from the pathof the clutchmechanism thereby to permit the release of the clutch mechanism andautomatically actuated means acting on the other stop member for movingthis member into "the path of the clutch mechanisms to intercept themovement of-the same irrespective of the position of the most advancedstop member.

'6. In a device of the class described,'the

combination With a clutch mechanism having a definite path of travel, ofa pair of stop members each pivoted for movement about a common axis andloosely mounted relative to each other and each movable across the pathof the clutch mechanism to intercept the movement of the same, saidmechanism normally held by the most ad- "vanced of the pair of stopmembers and said mechanism when in held position disposed in the path ofmovement of the other stop member, means for moving said advancedstop-member "from the path of the clutch 'mec'hanism thereby to permitthe release of the clutch mechanism and means acting 'on the other stopmember for moving this member automatically into the path of the clutchmechanism on the release of the most advanced stop member. i Y

7. Ina device of the class described, the combination With a clutchmechanism having a definite path of travel, of a pair of stop membersloosely mounted relative to each other, each movable across the path ofthe clutch mechanism to intercept the movement of the same, saidmechanism normally held by the most advanced of the pair of stop membersand said mechanism When in held position disposed in the path ofmovement ofthe other stop member, means for moving said advanced stopmember from the path of the clutch mechanism thereby to permit therelease of the clutch mecha-- nism,-means actingv on the other stopmember for moving this member automatically into thepath of the clutchmechanism on the release of the mostadvanced stop member and adjustablemeans for varying the length of movement of said other stop. memberduring its automatic movement.

:8. Ina device of the class described, the combination with a'clutchmechanism. havinga definite path of travel, of a pair of stopmemberseach pivoted for movement about a common axis and each movable acrossthe path of the clutch'mechanism to intercept the movement of the same,said mechanism normally held by the most advanced of the pair of stopmembers and said mechanism When in held position disposed in the path ofmovement of the other stop member, means for moving said advanced stopmember from the path of the clutch mechanism thereby to permit therelease of the clutch mechanism, means acting on the other stop memberfor moving this member automatically into the path of the clutchmechanism on the release of the most advanced stop member and means forresetting both of said stop members.

9. In a device of the class described, the combination, with a clutchmember having a definite path of ,movement, of a pair of stop memberseach pivoted for movement about a common axis and each movable acrosssaid path of movement to intercept the movement of the clutch member,manually controlled means for removing one of said step members from itsoperative position thereby to permit the release of the clutch memberand means acting on .the other stop member to move the same intointercepting position into said path, said last namedmeans designed tobecome active on the release of the clutch member.

10. In a device of the class described, the combination, with a clutchmember having a definite path of movement, of a pair of stop members,each movable across said path of movement to intercept the movement ofthe clutch member, manually controlled means for removing one of saidstop ine1nbers from its operative position thereby to permit the releaseof the, clutch member, means acting on the other stop member to move thesame into intercepting position into said path, said last named meansdesigned to become active on the release of the clutch member and meansfor regulating the movement of said other member to and from itsoperative position.

11. A device of the class described, comprising a pivoting member, atrip dog pivoted to said member, a rocking frame pivoted to said member,said frame including a stop finger, and a kicking device carried by theframe and designed to move the same into an operative position.

121A device of the class described, comprising a pivoting member, a tripdog pivoted to said member, a. rocking frame pivoted to said member,said frame including a stop finger, a kicking device carried by theframe and designed to move the game into an operative positionand meanscarried by the trip dog for engaging with the rocking frame to reset thesame;

18. A device of the class described, comprising a pivotmg member, a trlpdog Copies of this patent may be obtained for pivoted to said member, arocking frame pivoted to said member, said frame including a stopfinger, a kicking device carried by the frame and designed to move thesame into an operative position and means carried by the trip dog forengagingwith the rocking frame to reset the same and to energize saidkicking device.

1 1. In a device of the class described, a

support, pivoting bolt carried by said sup port, a tripping dog pivotedto said bolt, a

rocking fram pivoted to said bolt, a spring pressed plunger carried bythe frame and designed to kick the frame-into an operative position whenreleased, and resilient means reacting between said support and dog toreset the dog and frame into normal position and to place the plungerunder tenposition of the manually controlled means.

16. In a device of the class described, the combination with a clutchmechanism, and two stop members, means for pivotally supporting saidmembers, each designed to intercept the movement of the clutchmechanism, manually controlled means for movingone of the stop membersinto an inoperative position to permit the escape of the clutchmechanism, means controlled by the escape of the clutch mechanism formoving the other stop member automatically into an operative positionindependent of the position of the manually controlled means and meanscontrolled by the release of. the manually controlled means for movingsaid other stop member into an inoperative position and resetting thefirst named stop member into operative position.

' Signed at New York :city in the county of New York and State of NewYork this twelfth day. of June A. D. 1916.

RICHARD HOELEMANN.

five cents each, by addressing the f commissioner of Patents.'washington. 11C.

